Grinding machine guide block



Oct. 10, 1933. J. sUNNEN 1,929,613

GRINDING MACHINE GUIDE BLOCK Filed oct. 29. 1932 Patented Oct. r10, 1933 1,929,613" 'Y f' GRINDINQ MACHINE GUIDE BLOCK V t gJosephxsunnen, KrirlxwoocLMo.v` v Applieation octberzs, k193.2. serial N0.-

cfiomi 1 7 claims., (C1. 51-1s4.1)

cross-sectional detail taken on theiline 5415,01v 'l MyV inventionhas relation to improvements in engine cylinder grinding machines and it consists in the novel features of construction more fully set forth in the specification andv pointed out in the claims. t Y

The present invention is directed more particularly to the guide elements of a grinding machine of the type shown in my co-pending application, Serial 'Noi 233,788, led November. 17, 1927, and is an improvement over the guide blocks forming thesubject-matter of my application, Serial No. 608,373, led April 30, 1932. Y

In the guide block of the last mentioned application the blocks areresiliently mountedr on the ends of supporting elements carried by the carrier of the grinding machine, the arrangement being such that under the pressure imposed on vthe blocks in operation they'are capable of yielding in'a rectilinear direction. lFurthermore,the blocks are pressed outwardly toward the cylinder Wall by means of a spring at each'end 'of the .blockY and it is possible in operation'for either end of `the block to yield or move inwardlywithout any movement at the opposite end of the block.

It is the object'of the present invention .to vso mount the blocks on their supports that angular or rotatory movement Willbe imparted to-v them under excessive pressure instead of rectilinear movement, and that when the blocks are so moved the cumulative pressure exerted by the springs at both ends Will movement so that the block is incapable of yieldingat one'end only. 'l

It is the further object of the present invention to simplify the construction of the guide block by eliminating the carriers `or `holders for theblocks. In the present construction the blocksV are carried di- 1 rectly by the racks which serve as the supports, -from the ends of which they are securely although yieldingly supported. These advantages, together with others inherent in the invention, Will be better apparent from a detailed description of the same in connection withthe accompanying drawing, in which:

Figure 1 is a side elevation of a grinding machine provided vvith my improved guide elements, part of said machine being'broken away; Fig. 2 is a horizontal cross-section through the machine taken on the line 2-2 of Fig. 1; Fig. 3 is an elevation of one of theguide elements 'looking at the working face thereof; Fig. '4 is a longitudinal section through the guide'element taken on the line 4-4 of Fig. 3; and Fig. 5 is an enlarged 'bar 13 whichv form the support for serve to oppose and resist the from the guide block assembly 520, over 'Which'the extremity Fig. 3. t.

`Referring to the drawing, 1 represents the tool holder ofl a, Sunnen cylinder grinder'of the type described in the above referred to'patent application, said holder being Suspended by a'yoke 2 and collar' 3 from a, drive shaft 4. The collar 3 is pivotally connected tothe holder 1 by means of .studs `5, 5, and the yoke 2 Ais pivotally connected tothe collar by means of studs 6, 6 sothat a universal joint connection is formed betvveen the shaft 4 and the holdery 1. The holderI 1 is provided With a longitudinally disposed axial bore 7 Within Whichis' housed a pinion shaft 8 rotatable by means lof the adjustingheadl'for the purpose of extending and retracting abrasive elements 10, 10 and guide elements' 11, V11 comprising the tools carried vby the holder. vThe construction and the `operation of the tool holder, comprising the parts just described, is substantially the same as 'that of the holderof my honing device describedvin detail in the aforesaid patent application and will not `be further described herein except insofar as .necessary to explain the operation of the guide elements 11, 11.v

i ,'lfhe'guide elements 11, 1:1 vcomprise an' angleshaped block 12 carriedlo'n the outer ends otrack the block, said racks being slidably mounted in transverse bores v14:, 14 intersecting Withthe axial bore 7 so that the teeth t4 of the racks will mesh with the elongated pinion 8. The outer end of each rack bar 13 terminates in successively reduced portions 15 and 16, the reduced portion 15 passing through an opening 1'7 in what may be termed the'base A18 of the guideblock, Whilethe reduced portion 16 passes through an opening v19 ina retaining strip of said reduced portion 16 is riveted. Thusthe retaining vstripV 20 is firnllyiixedvto the rack bar 13v` in spaced relation with the shoulder s formed by the reduced portion or stem 15. It will be observed that the length of the stern 15 is greater than the thickness of the base portion 18 of the block so that space is provided between the inner surface 18 of the block and the shoulder s for a spring 21 in the shape of a concavo-convex Washer or perforated disk. The spring Washers 21 exert their influence to hold the block 12 outwardly in contact with the retaining strip 20 and possess vsuiiicient tension to hold the Working surface 22 of the guide block irmly againstthe cylinder'wall C When the grinding machine is in operation. However, when pressure is brought to bear against the Working facev 22 of the guide block due to medial portion 22";

the vibrations of the machine in operation the spring washers 21 will yield, becoming flattened (as shown in Fig. 5) and allow the block 12 to be tilted or rotated rearwardly with respect to the direction of rotation of the machine. Obviously, the compression of the springs 21, 2l increases the pressure with which the guide block bears against the cylinder wall, which pressure amounts to approximately twenty pounds on each spring, ora total of forty pounds when the blocks 12 are rotated backwardly their maximum amount, that is, when the springs 2l, 21 are completely compressed.

As explained in my pending application, Serial No. 607,373, best results are obtained fromy the grinder when a free clearance of' approximately .015 is maintained between the working faces 22, 22 of the guide blocks and the cylinder wall. However, it is impossible in practical operations to maintain this clearance at any denitely xed point and clearance is often'reduced during the grinding operation. With myimproved guide blocks an inward movement of approximately .0207' may be obtained on each block by compressing springs 2l so that it is possible to obtain a total relative movement between the blocks and the cylinder wall of approximately .035. Obviously, after the free clearance of .015" has been taken up any further relative movement between block and cylinder wall willV exert uniformly increasing pressure on the blocks. This increased pressure between the blocks and the cylinder wall will cause the face 22 of the blocks to wear more rapidly, thus gradually increasing the clearance between'the blocks andwall until the normal operating clearance is again obtained. Thus the blocks may properly be said to be self adjusting with respect to the amount of clearance between them and the cylinder wall. Y

Itwill be observed (Fig. 3) that the working face 22 of the block 12 is reduced in area at its As there is a tendency for the blocks to wear more rapidly toward the ends fdue to the instability with which the grinding machine is held by the operator this reduction in area of the working face counteracts this tendency-so that the entire working face of the block will wear off substantiallyuniformly. K

As in my application, Serial No. 608,373, aforesaid, the block 12 is composed of a material that isrelatively non-abrasive as it must not score the cylinder wall as it is rotated thereover. In addition to Vthis property it should also be comparatively friableso that when the pressure of .the :block against the cylinder wallC becomes greater than normal due to a decrease in the clearance between the block and thercylinderwall the working face 22 of the block will.wear off with suiicient rapidity to quickly restore the -normal pressure. I have found that onematerial possessing these properties is die cast metal containing zinc, copper and aluminum.

Having described my invention, I claim: Y

1. A guide element for cylinder grinding machines compnising an elongated block adapted for contact with the cylinder, supporting elements for said block, said supporting elements having yielding connection with the block adjacent to the vends thereof, and the block being rotatable, relative to the supporting elements.

2. A guide element for cylinder grinding machines comprising a guide block adapted for contact with the cylinder, supporting elements for saidl block, said block having rotatable connection with said supporting elements.

3. A guide element for cylinder grinding machines comprising a guide block adapted for Contact with the cylinder, supporting elements for said block, said block being yieldingly and tiltably carried by said supporting elements.

4. A guide element for cylinder grinding machines comprising a guide block adapted for contact with the cylinder, said block having a laterally extending base, and the ends of said base having yielding and tiltable connection with the ends of the supporting elements'.

' 5. A guide element for cylinder grinding machines comprising a guide block adapted for contact with the cylinder, said guide block having a base component and a cylinder Vcontacting component, suitable supporting elements for the block, and means on the ends of the supporting elements for securingV the base component of the block thereto, and springs associated with the securing means effecting a yielding connection between the supporting elements-'and the blocks.

6. A guide element 4for cylinder grinding machines comprising a guide block adapted lfor contact with the cylinder, said guide block having a base component and a cylinder contacting component, suitable supporting elements for the block, and means on the ends of the supporting elements for connection withV the base component of the block and a spring washer between each supporting element and the-block for imposing tension on said block.

7. A guide element for cylinder grinding machines comprising a Vguide block having a base component and a cylinder contacting component,

supporting elements for the block, a stem at the 

